title: Effects of high-velocity resistance training on muscle function, muscle properties, and physical performance in individuals with hip osteoarthritis: a randomized controlled trial.
abstract: OBJECTIVE
  To investigate the effects of high-velocity resistance training on muscle function, muscle properties, and physical performance in patients with hip osteoarthritis by comparison with those of low-velocity resistance training.
  
  
  METHODS
  Single-blind randomized controlled trial.
  
  
  METHODS
  Home-based exercise programmes.
  
  
  METHODS
  A total of 46 women with hip osteoarthritis were randomly assigned to the high-velocity (n = 23) or low-velocity (n = 23) training group.
  
  
  METHODS
  Both groups underwent an eight-week daily home-based resistance training programme using an elastic band. Exercises involved hip abduction, extension, and flexion and knee extension. Participants in the high-velocity group performed the concentric phase of each repetition as rapidly as possible and returned to the initial position eccentrically in 3 s. Participants in the low-velocity group performed both the concentric and eccentric phases in 3 s.
  
  
  METHODS
  The following outcome measures were evaluated: isometric muscle strength, muscle power, muscle thickness, muscle echo intensity, maximum walking speed, Timed Up and Go test, 3-minute walking test, Harris Hip Score, and hip pain.
  
  
  RESULTS
  Decreases in the time for performing the Timed Up and Go test (mean changes: high-velocity group -0.46 s, low-velocity group -0.23 s) and echo intensity of the gluteus maximus (mean changes: high-velocity group -6.8, low-velocity group -1.0) were significantly greater in the high-velocity group than in the low-velocity group. No significant difference was observed in changes of other outcome measures between the groups.
  
  
  CONCLUSIONS
  This study revealed that high-velocity training for patients with hip osteoarthritis has partially a greater effect on muscle properties and physical performance than low-velocity training.
authors.affiliation: 1Faculty of Rehabilitation, Kobe Gakuin University, Kobe, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Fukumoto
authors.forename: Hiroshige
authors.initials: H
authors.lastname: Tateuchi
authors.forename: Tome
authors.initials: T
authors.lastname: Ikezoe
authors.forename: Rui
authors.initials: R
authors.lastname: Tsukagoshi
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Akiyama
authors.forename: Kazutaka
authors.initials: K
authors.lastname: So
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Kuroda
authors.forename: Noriaki
authors.initials: N
authors.lastname: Ichihashi
mesh_terms: D005260:Female; D006801:Humans; D008875:Middle Aged; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000503:physiopathology; D015207:Osteoarthritis, Hip / Q000503:physiopathology* / Q000534:rehabilitation*; D010809:Physical Fitness; D055070:Resistance Training / Q000379:methods*; D016037:Single-Blind Method; D016138:Walking
keywords: Hip osteoarthritis; high-velocity resistance training; muscle power; physical performance; treatment velocity